The trial, expected to last about a month, will determine whether Amazon violated the Federal Trade Commission Act and the Restore Online Shoppers' Confidence Act. If the FTC prevails, Amazon could face fines, customer refunds, and new restrictions on how it markets and cancels subscriptions. "Specifically, Amazon used manipulative, coercive, or deceptive user-interface designs known as 'dark patterns' to trick consumers into enrolling in automatically renewing Prime subscriptions," the FTC complaint said. U.S. District Judge John Chun last week delivered a partial win to the FTC, ruling that Amazon violated federal law by collecting payment details before disclosing key terms and holding that two Amazon executives could be found personally liable if violations are proven. He also barred Amazon from arguing that federal shopper protection laws don't apply to Prime.